学年

質問の種類

数学 高校生

?してる所を教えて欲しいです。 よろしくお願いします。

(左辺)= a+6+c< ab+1+c (2) a+b+c< abc+2 は,(1)の a+b< ab+1 とよく似ている。 「Action》 複雑な不等式の証明は, 既知の不等式を利用せよ 園(1)(右辺)-(左辺) =D (ab+1)- (a+b) の不等式が成り立つことを証明せよ。 (2) a+b+c<abc+2 (1) a+b<ab+1 1 前問の結果の利用 (1)の利用 工積をつくりたいコ ab+c+1< ロ+1= abc +2= (右辺) (6-1)a-(b-1) = (a-1)(b-1) lal<1, 16l<1であるから a-1<0, _b-1<0 よって すなわち (a-1)(b-1) >0 ab+1-(a+b)>0 1A<0, B<0 のとき AB>0 ab+1>a+b したがって (2)(1)より a+6<ab+1 であるから (左辺) = (a+b)+c<(ab+1)+c=ab+c+1…① ここで,lal<1, |6| <1 より また,Ic| <1であるから ab+c<ab·c+1= abc+1 4()に(1)を利用。 4ab を(1)のa,cを(1)の 6とみて不等式を利用 するために,lab|<1, Ic|<1 を確認する。 labl<1 2 く 0, 2より (左辺)<(ab+c)+1<(abc+1) +1= abc+2 したがって a+b+c<abc+2 -s2) (別解) (右辺)-(左辺) = (abc+2)-(a+6+c) 1つの文字に着目 = (ab-1)c-(a+6)+2 (ab-1)c-(ab+1)+2 )に(1)を利用。 cについて整理する。 = (ab-1)c-(ab-1) 2? (ab-1)(c-1) ここで,|al<1,|6| <1 より,|ab| <1 であるから 小をはい ab-1<0 また,Ic|<1 より c-1<0 8 会 よって (ab-1)(c-1)>0 ゆえに (abc + 2) -(a+b+c)>0 したがって a+b+c<abc+2 8 次の不等式を証明せよ。また, 等号が成り立つのはどのようなときか。 (1) |a+b| S la|+ ||| 練習 → p.127 問題71 。式と証明 思考のプロセス

未解決 回答数: 1
英語 高校生

ELEMENT2 lesson3のページです。Cのリスニングの解答わかる方、教えて欲しいです

B Reading for details : Fill in the blanks with the words in the box below, and then choo, To Comprehension, daLbaboan d Vocabulary Reading for main ideas: Choose the best answer. orfw tong 00g 1. What is the main idea of the passage? A Choose the correct SS a 1. The report he m space. mitaoo poY 2. I felt an overw ©A professor kindly agreed to let a promising teenager use his lab 2. Teenagers can make the world a better place by @ living up to their uncle's words bgetting a lab to carry out experiments working hard and going through many trials 3. Although there out his plans. 4.I am disappoir 5. It takes a lot c SS the correct title for each part. C d > Pancreatic cancer tends to be diagnosed too late due to poor detection (1. >A high school student named Jack Andraka decided to come up with a 1 way to detect it when his close friend (2.g1 ) the disease. Part 1 B Choose the c > Jack found a database of (3 Protelns number of proteins to be checked was no less than 8,000. S which are related to pancreatic cancer, but ih 1019o6 1. I'm sorry, Part 2 > He went through the list one by one and found a protein that can be used o. (4.moyke) to detect the cancer. 2. They were 3. Most peo > Jack wrote to 200 professors and asked them to let him use their lab space fr further experiments, but almost all of them (5k0eyhis request. Part 3 (よ) anterected. C Fill in the > One professor was (6. in his plans and invited him for an interview. > Jack managed to answer all the (7. 0esting 1. There w , Ther ) asked at the interview and gu space in a lab. > Several months later, he successfully came up witha new detection method which is faster, cheaper and more (8. new method. 一→ Part 4 dnie 2.I found →I ca ). He changed the world with the accurceと 3. It tool Titles → Itt Words 9 O Finding the Marker Protein D His Success and a Great Detection Method 4. I am interested / proteins / accurate got / questions / rejected marker / methods →I © Jack Andraka's Decision © Trying to Get Lab Space 5. She c Listening for details : Listen to the statements and answer T(true) or F(false).. Tips pa D Retelling the story : Look at the pictures on pages 48-49, and retell the story. 味で 52 A Teenager To Change the World 8-

回答募集中 回答数: 0